rounding rule

[hamzaali]

In rounding there is rule that "if discarded digit is exactly 5, the previous digit is unchanged, if it is even and is increased by 1, if it is odd". e.g: 54.45 is rounded to 54.4 while 54.55 is rounded to 54.6.
So why we don't increase digit incase of even and why we increase the previous digit if it is odd? i.e why 54.45 is not rounded as 54.5?

 

[hamzaali]

Thanks

love you sir..... finally i got answer.....

 

[jonah2.0]

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In rounding there is rule that "if discarded digit is exactly 5, the previous digit is unchanged, if it is even and is increased by 1, if it is odd". e.g: 54.45 is rounded to 54.4 while 54.55 is rounded to 54.6.
So why we don't increase digit incase of even and why we increase the previous digit if it is odd? i.e why 54.45 is not rounded as 54.5?

http://en.wikipedia.org/wiki/Rounding#Round_half_to_even